268 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



D. MuehlenhecMi ; capsule shorter, cernuous; peristome very low, pale 

 purple, within scarcely barred; teeth divided to middle, legs narrowed. 

 D. MuehlenhecMi hrevifoUum Lindb., Limpr. Laubm. 1: 355.— God- 

 havn, Greenland; Digges Island, Hudson Bay. 



75. Dicranum dipteroneiiron C. Mull. — Tufts rather dense, radiculose, 

 an inch high: stems dichotomous, flexuous: leaves laxly erect, rather broad, 

 small, yellowish green, shining, stiffish, smooth, flexuous, when moist 

 rather strict, broadly lanceolate, stoutly acuminate, involute, coarsely and 

 unequally serrate near apex; costa thicker at base, gradually narrowed, 

 with two parallel serrulate low wings on back above; cells large, elliptical 

 above, longer at base, walls thick, pitted, alar cells numerous, brownish: 

 perichsetial leaves similar: seta erect, scarcely an inch long, slender, slightly 

 twisted, red at base, yellowish above; capsule arcuate, very narrow, small, 

 obliquely long rostrate; calyptra very narrow, smooth. Flora 70: 219. 1887. 

 — Alaska. 



7G. Dicranum pallidum Bry. Eu. (not Mull.).— In compact green or 

 yellowish tufts: stems 2-4 cm. long, simple or dichotomous, covered below 

 with ferruginous tomentum: leaves erect-patent or subsecund above when 

 moist, flexuous and somewhat crispate when dry, oblong-lanceolate, long 

 narrowed acuminate, generally somewhat inflexed at margins, subcanali- 

 culate, smooth or papillose at back, serrulate above; costa percurrent or 

 excurrent, generally papillose and denticulate at back above, sometimes 

 nearly smooth; cells short, angular, irregular in the upper part, linear, 

 elongated towards base, the alar, large, lax, quadrate or sub-hexagonal, 

 orange brown: outer perichtetial leaves from a broad base suddenly con- 

 stricted into a more or less elongated denticulate point, the inner convolute 

 sheathing, abruptly subulate from the rounded apex: seta yellowish; cap- 

 sule pale, cernuous or sub-erect, oblong or subcylindric, arcuate, slightly 

 plicate when old, neck small, strumose; lid conic, long subulate rostrate; 

 annulus distinct; teeth purple, cleft to the middle or below into 2-3 free 

 or coherent legs. D. sabuletorum R. & C, Bot. Gaz. 14: 91. 1889. D. 

 spurium var. condensatum L. & J., not D. condensatum Hedw., L. & J. 

 Man. 76. In dry sandy places on hills especially in southern district: 

 Florida; S. Carolina. 



7 7. Dicranum scoparinm compactuni Ren.— Tufts very compact: leaves 

 slightly homotropous, often broken at point, dentate, acumen short: ster- 

 ile. Fl. Miq. 44.— Miquelon Island. 



78. Dicranum scoparium flexicaule Ren. & Card.— Stems long, slender, 

 decumbent, then erect, flexuous, innovations slender, reaching or exceed- 

 ing the capsule: leaves erect incurved, slightly flexuous, somewhat long 

 acuminate, entire or sinuolate-crenulate; costa vanishing below apex; cells 

 with delicate sinuate walls not or but slightly pitted: capsule reddish, 

 irregularly rugose-plicate when dry. Fl. Miq. 44.— Miquelon Island. 



